Improving the Methodology for Assessing Mild Cognitive Impairment Across the Lifespan
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1 Improving the Methodology for Assessing Mild Cognitive Impairment Across the Lifespan Grant L. Iverson, Ph.D, Professor Department of Physical Medicine and Rehabilitation Harvard Medical School & Red Sox Foundation and Massachusetts General Hospital Home Base Program Presidential Address National Academy of Neuropsychology, November 5, 2015
2 Research Support & Funding Disclosure Canadian Institute of Health Research Lundbeck Canada AstraZeneca Canada ImPACT Applications, Inc. CNS Vital Signs Psychological Assessment Resources, Inc. Tampere University Hospital Alcohol Beverage Medical Research Council Rehabilitation Research and Development (RR&D) Service of the US Department of Veterans Affairs Defense and Veterans Brain Injury Centerj US DoD InTRUST Mooney Reed Charitable Foundation
3 Royalties Disclosure WCST-64 Two books, one is on the WAIS-IV/WMS-IV
4 Standing on the Shoulders: Reitan, Mattarazzo, Golden, & Heaton Thanks for the Lift: Franzen, Larrabee, Millis, Rohling, Chelune, Crawford, Schretlen Primary Collaborators: Brooks, Holdnack, & Lange
5 Broad Topics Defining and conceptualizing mild cognitive impairment Improving the scientific underpinnings of clinical judgment Using Multivariate Base Rates in Clinical Practice
6 To challenge our assumptions and beliefs. To build the foundation for a change in our clinical practice.
7 Prevalence of Low Scores in Healthy Children, Adolescents, Adults, and Older Adults? Most neuropsychologists don t know Higher the cut-off, greater the number of low scores More tests you give, the more likely you are to get low scores
8 How Do You Define Impairment? Scores below the 16 th percentile (1 SD)? Scores below the 10 th percentile? 5 th percentile? 2 nd percentile (2 SDs)?
9 Neuropsychological Assessment Battery (NAB) Takes approximately 3.5 hours to administer 24 tests 36 Primary Test Scores MANY additional test scores
10 Impairment < 1 SD (16 th percentile) What percentage of healthy adults have one or more low scores? 92% 3 or more? 66% 5 or more? 44%
11 Impairment = 5 th Percentile What percentage of healthy adults have one or more low scores? 70% 3 or more? 31% 5 or more? 16%
12 Deficit Measurement & Confirmatory Bias Assume Something is Wrong Test Until You Find It Profile Sheets Make Sense of the Data HARKing Hypothesizing After the Results are Known How many of you ran 100 t-tests for your dissertation?
13 Challenges in Clinical Practice There is no well-accepted criteria for defining cognitive impairment. Two neuropsychologists analyzing the same battery of tests will often interpret them differently. The interpretation of neuropsychological tests relies heavily on clinical judgment. Clinical judgment is influenced greatly by clinical experience. Clinical experience is anecdotal evidence. Anecdotal evidence is one of the lowest forms of evidence.
14 Until recently, we did not know the probabilities or our error rates. If I say someone has an acquired deficit in memory, what is the probability that I am right? What is the false positive rate for that conclusion? If I say someone does not have a memory problem, what is the probability that I am right? What is the false negative rate for that conclusion?
15
16 Image Removed
17 Image Removed
18 Clinical Question: Does a pattern of performance occur at a specific point on the curve? (not a single test score) Unusually Below Above Low Average Average Average Superior 2 SDs & 1.5 SDs
19 The Basics What is the definition of cognitive impairment?
20 There is no universally agreed upon definition of cognitive impairment or methodology for establishing the severity of cognitive impairment.
21 A Few Examples of Definitions Mild Cognitive Disorder (ICD-10) Cognitive Disorder Not Otherwise Specified (DSM-IV) Mild Neurocognitive Disorder (DSM-5) Major Neurocognitive Disorder (DSM-5) Dementia (ICD-10 and DSM-IV)
22 DSM-IV Cognitive Disorder NOS: Mild Neurocognitive Disorder Attention/Processing Speed Language Learning and Memory Cognitive Disorder NOS Perceptual-Motor/Spatial Abilities Executive Functioning
23 When Will We Have a Unified Definition of Cognitive Impairment? If we don t do it, our physician colleagues will do it for us. DSM-V Major Neurocognitive Disorder Minor Neurocognitive Disorder
24 DSM-5 Mild Neurocognitive Disorder (aka, Mild Cognitive Impairment; MCI) Major Neurocognitive Disorder (aka, Dementia)
25 DSM-5 Impairment must be present in 1 or more cognitive domains. For Major Neurocognitive Disorder, performance is typically 2 or more standard deviations below appropriate norms (3 rd percentile or below). For Mild Neurocognitive Disorder, performance typically lies in the 1 2 standard deviation range (between the 3rd and 16th percentiles).
26 What does that mean? Based on what? Average cognitive domain scores? Individual tests? Based on how many scores in each domain? Test performance and clinical judgment?
27 Neuropsychological Assessment Battery (NAB) Takes approximately 3.5 hours to administer 24 tests 36 Primary Test Scores Many additional test scores
28 5 NAB Domain Scores (M=100; SD=15) Attention (and processing speed; average of 11 scores) Language (average of 5 scores) Learning and Memory (average of 10 scores) Spatial Skills (average of 6 scores) Executive Functioning (average of 4 scores)
29 Percentage of Healthy Adults Meeting Testing Criteria for DSM-5 Mild Neurocognitive Disorder? 36.9%! (based on 1 or more domain scores below 1 SD)
30 Prevalence of Low Scores Varies by Estimated IQ
31 Percentages of Healthy Adults Meeting Testing Criteria for DSM-5 Mild Neurocognitive Disorder! (considering 5 NAB Domain Scores; 1 or more 1SD) (Source: Iverson et al., 2008) All Adults 82.1 Below Average IQ 39.1 Average IQ 16.7 Above Average IQ
32 What about DSM-5 Major Neurocognitive Disorder?
33 Percentages of Healthy Adults Meeting Testing Criteria for DSM-5 Major Neurocognitive Disorder (considering 5 NAB Domain Scores; 1 or more 2SD) (Source: Iverson et al., 2008) All Adults Below Average IQ 4.6 Average IQ 0.3 Above Average IQ
34 Wait, it gets worse What if a clinician or researcher defined impairment based on a single abnormal test score?
35 Considering MCI / DSM-5 Mild Neurocognitive Disorder A selected battery of tests that takes approximately 2.5 hours to administer (derived from the NAB-which normally takes hours to administer) Norms: Age, Education, and Sex adjusted Number of Tests: 18 Number of Scores Considered: 23
36 If MCI is based on 1 score (out of 23) below 1 SD, how many healthy adults would have MCI? 81.2% 2 or more low scores? 63.4% 4 or more low scores? 35.8%!
37 If DSM-5 Major Neurocognitive Disorder is based on 1 score (out of 23) below 2 SD, how many healthy adults would have Dementia? 33.5%! 2 or more low scores? 13.2% 4 or more low scores? 4%
38 What about children?
39 Percentage of Children with a Low Score on a 2-Hour NEPSY-II Battery (age 7-16; considering 17 scores; 1 or more 10 th percentile) (Source: Brooks, Sherman, and Iverson, 2010) All Children 84.4 Parent's Education 11 or less 54.5 Parent's Education 16+
40 If DSM-5 Major Neurocognitive Disorder in a child or adolescent is based on 1 score (out of 17 scores, on a 2-hour NEPSY-II battery) below 2 SD, how many healthy children would have the disorder? 14.7% Parental education 11 or fewer years? 31.3%! Brooks et al., 2010
41 Simple Application of Base Rates: Participants Multiple Sclerosis 30 patients with MS 30 healthy controls from the NAB standardization sample were individually matched on sex, age, education, and ethnicity Battery: Neuropsychological Assessment Battery (NAB): 5 Index Scores
42 Attention Language Spatial Memory Executive Functioning Controls Multiple Sclerosis
43 80 70 Percentage with 2 or More Low NAB Index Scores Controls 3.3 Multiple Sclerosis 1SD 10th percentile 5th Percentile
44 Back to Basics Conceptualizing levels of cognitive impairment
45 Levels of Cognitive Impairment Mild Cognitive Diminishment Mild Cognitive Impairment Moderate Cognitive Impairment Severe Cognitive Impairment Profound Cognitive Impairment
46 Mild Cognitive Diminishment This is not cognitive impairment. Instead, this represents a mild diminishment in cognitive functioning. It may or may not be identifiable using neuropsychological tests. It can, but does not always, have a mild adverse impact on a person s social and/or occupational functioning. It may or may not be noticeable by others.
47 Mild Cognitive Impairment Should be identifiable using neuropsychological tests. This impairment has a mild (sometimes moderate) adverse impact on a person s social and/or occupational functioning.
48 Moderate Cognitive Impairment This level of cognitive impairment has a substantial impact on everyday functioning. This impairment should be noticeable to others in regards to the person s social and/or occupational functioning.
49 Severe Cognitive Impairment The cognitive impairment has a substantial adverse impact on everyday functioning. This level of impairment would render the individual incapable of competitive employment. The person should not be driving a motor vehicle, and might have difficulty with activities of daily living.
50 Profound Cognitive Impairment/ Severe Dementia The cognitive impairment would render the person in need of 24-hour supervision and assistance with daily activities, which he or she may receive at home, in a nursing home, or other institution.
51 Is all this really that important? MCI / Prodromal Dementia
52 Lancet Neurology, 2007
53
54 *Low scores are 1 to 1.5 SDs below the mean *Low scores in 1 or more Cognitive Domains
55 MCI: Criteria for the Clinical and Cognitive Syndrome Concern regarding a change in cognitive functioning (patient or family) Impairment in one or more cognitive domains (1 to 1.5 SDs below the mean for age-education adjusted normative scores) Preservation of independence of functional abilities Not demented
56 Potential Problem with Diagnostic Guidelines Greater than expected and poorly understood rates of: False Positives False Negatives
57 Revert to Normal on Retesting Authors Retest Percentage Loewenstein et al., year 7.7% Fischer et al., years 16.2% Perri et al., years 17.2% Fisk et al., years 31.2% Alexopoulos et al., years 40% Larrieu et al., years 41.4% Kryscio et al., years 52.5% Ganguli et al., years 55%
58 Were some misdiagnosed?
59
60 WMS-III: Accidental MCI WMS-III Older Adults Study N = Age-Corrected Scaled Scores Logical Memory I & II Verbal Paired Associates I & II Faces I & II Family Pictures I & II Base rates of low scores Brooks, Iverson, Holdnack, & Feldman (2008)
61 5 th Percentile Cut-Off Total Sample = 26% (MCI) WTAR-Demographics Predicted FSIQ Low Average = 43% High Average = 21%
62
63 3 WMS-III Memory Subtests Logical Memory, Verbal Paired Associates, and Visual Reproduction 8 scores: Immediate, Delayed, Recognition 450 Healthy adults from the normative sample
64 Criteria for MCI: 5 th Percentile Percentage of healthy older adults who met criteria: 30% However, having 3 or more scores at or below the 5 th percentile occurred in only 5.1%
65 Do Demographically-Adjusted Norms Correct the Problem? Wechsler Memory Scale Fourth Edition (WMS-IV)
66 Prevalence (% of healthy adults) of low scores on the WMS-IV using age- and demographically-adjusted normative data: Cutoff < 1SD and 5 th percentile Age Norms or more: 1SD 1 or more: 5th Percentile Demographic Norms or more: 5th percentile
67 What if we stratify low scores by estimated premorbid intelligence? Age versus Demographically-Adjusted Norms
68 Memory Batteries: Wechsler Memory Scale Third Edition NAB Memory Module WMS-III: 4 tests, 8 scores (immediate and delayed) NAB: 4 tests, 10 scores (immediate and delayed)
69 Percentage of healthy older adults with one or more low memory scores ( 5th percentile) Low Average Average High Average Superior NAB Memory WMS-III Age WMS-III Demo
70 Five psychometric principles for interpreting scores Low scores are relatively common across all test batteries Low scores depend on where you set your cutoff score Low scores vary by number of tests administered Low scores vary by demographic characteristics of the examinee Low scores vary by level of intelligence.
71 Intelligence The most sophisticated normative data is adjusted for sex, age, education, and ethnicity Good normative data is adjusted for sex, age, and education Many normative sets are adjusted for age only
72 Consider 4 WMS-IV Indexes: Auditory Memory, Visual Memory, Immediate Memory, Delayed Memory 1 or more low scores ToPF-Demographics Estimated IQ Ranges All Adults Low Average IQ < 1SD < 5th Percentile Average IQ High Average IQ
73 Low Scores in Children by Years of Parental Education (ages 7-16; 4 or more low scores out of 17, 10 th Percentile, NEPSY-II) or Fewer Brooks et al., 2010
74 Image Removed
75 Can multivariate base rates strengthen the foundation of clinical judgment?
76 Clinical Question: Does a pattern of performance occur at a specific point on the curve? (not a single test score) Unusually Below Above Low Average Average Average Superior 2 SDs & 1.5 SDs
77 Published Base Rate Tables
78 WAIS-IV/WMS-IV Base rates of low scores Battery: 20 Subtests Domains: Processing Speed, Working Memory, Memory
79 Impairment = 5 th Percentile What percentage of healthy adults have one or more low subtest scores (out of 20)? 42.9% 3 or more? 17.3% 5 or more? 9.0% 7 or more? 5.2%
80 Impairment < 1 SD (16 th percentile) What percentage of healthy adults have one or more low subtest scores (out of 20)? 77.8% 3 or more? 51.6% 5 or more? 33.4% 9 or more? 14.4%
81 Domain-Specific Base Rates Refer to the online Appendix for Chapter 2 (Multivariate Base Rates for WAIS-IV and WMS-IV)
82 Processing Speed: WAIS-IV (3 Test Scores: Coding, Symbol Search, Cancellation) Scaled Score = 7 or lower (Bell Curve Predicts: 16%) 1 low score = 36.3% 2 low scores = 17.4% 3 low scores = 5.5% Scaled Score = 5 or lower (Bell Curve Predicts: 5%) 1 low score = 12.8% 2 low scores = 3.9% 3 low scores = 0.7%
83 Working Memory: WAIS-IV (3 Tests: Digit Span, Arithmetic, Letter Number Sequencing) Scaled Score = 7 or lower 0 low scores = 68.2% 1 low score = 31.8% 2 low scores = 13.7% 3 low scores = 5.0% Scaled Score = 5 or lower 0 low scores = 90.2% 1 low score = 9.8% 2 low scores = 2.9% 3 low scores = 0.6% Bell Curve Predicts: 16% Bell Curve Predicts: 5%
84 Considering 3 NAB Tests of Executive Functioning (Mazes, Categories, and Word Generation)? How many healthy adults have 1 or more tests below 1SD (16 th percentile)? 32.7% How many healthy adults have 1 or more tests below 2SD (2 nd percentile)? 5.8%
85 Can we raise the bar for a low score? Heresy alert! Heresy alert!
86 Neuropsychologists Dream of This (Normal vs. Clinical Groups)
87 The Reality of Cognitive Assessment (Normal and Clinical Groups Overlap)
88 Raising the bar for a low score
89 Low Score = 25 th Percentile WMS-IV: 4 Delayed Memory Subtests High Average Intelligence 1 or more low scores = 37.4% 3 or more low scores = 4.1% Average Intelligence 1 or more low scores = 61.4% 3 or more low scores = 15.4%
90 Applying Domain-Specific Base Rates to a Patient with a Moderate TBI
91 Moderate TBI University Graduate: High Average IQ WAIS-IV Working Memory Digit Span = 11 Arithmetic = 8 Letter Number Sequencing = 8 Probability in Healthy Adults = 2.5%
92 Moderate TBI University Graduate: High Average IQ WAIS-IV Processing Speed Coding = 8 Symbol Search = 10 Cancellation = 8 Probability in Healthy Adults = 12.7%
93 Frontal Brain Tumor (Average Premorbid IQ) 3 Executive Function Tests from the NAB Mazes, Categories, and Word Generation Criteria for Possible Impairment (20% Base Rate) 2 Scores 25 th Percentile 1 Score < 10 th Percentile Criteria for Probable Impairment (10% Base Rate) 3 Scores 25 th Percentile 2 Scores < 1 SD Percentile
94 Child with ADHD and a Moderate TBI Children s Memory Scale 6 Index Scores: Learning, Verbal Immediate, Visual Immediate, Verbal Delayed, Verbal Delayed Recognition, and Visual Delayed 3 or More Scores < 1SD, Base Rate = 11.8% 2 or More Scores 5 th Percentile, Base Rate = 8.6% Brooks, Iverson, Sherman, and Holdnack, 2009
95 Conclusions
96 Image Removed
97 Five psychometric principles for interpreting scores Low scores are relatively common across all test batteries Low scores depend on where you set your cutoff score Low scores vary by number of tests administered Low scores vary by demographic characteristics of the examinee Low scores vary by level of intelligence
98 Base Rate Analyses Are Now Available For Many Batteries WAIS-III / WMS III WMS-III WAIS-IV / WMS-IV WMS-IV WISC-IV ImPACT CNS-Vital Signs ANAM TBI Mil Neuropsychological Assessment Battery (NAB) E-HRNB Children s Memory Scale NEPSY-II
99 Clinical Question: Does a pattern of performance occur at a specific point on the curve? (not a single test score) Unusually Below Above Low Average Average Average Superior 2 SDs & 1.5 SDs
100 Base Rates Help Reduce False Positives in Low Functioning People Reduce False Negatives (misses) in High Functioning People Strengthen the Scientific Underpinnings of Clinical Judgment
101 Thank You
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